Lamp.



E. M. ROSENBLUTH. LAMP.

AIP-PLIOATION FII-ED JAN. 24, 1907. I

Patented July 26, 1910.

um y Ill!!! 27 23 26 2J i J f@ 0 L u UNITED STATES PATENT OFFICE.

EDWIN M. ROSENBLUTH, OF PHIL-ADELPHIA, PENNSYLVANIA.

LAMP.

Specification of Letters Patent.

Patented July 26, 1910.

Application filed January 24, 1907. Serial No. 353,804.Y

portion of the light generated inthe lamp casing is condensed and projected therefrom substantially parallel with the focal axisI of the lamp casing.

Itis an object of my invention to provide a single lamp structure which may be advantageously employed as a head light for an automobile, motor boat or other vehicle,- being provided with means to produce and project a central beam of light substantially parallel with l, the focal axis of the lamp casing, to illuminate objects`at a distance, and to produce and project a broad field of diffused light local to the region immediately in front of the lamp casing.

My invention comprises a lamp casing containing two reflectors Vand means ar-` ranged to produce two separate flames, one of said flames being local to the focal center of one of said reflectors, and the other of said flames being local to the focal center of the other of said reflectors.

In the form of my invention hereinafter described, said two reflectors are located respectively at the front and rear of said casing, and have a common focal axis, the front reflector being parabolic and the rear reflector spherical, and, the two flames are -produced by alsingle burner extending between said two reflectors, the front flame being local to the focal center of the rear reflector and the rear flame being local to the focal centerof the front reflector. The front flame being in front of the focal center of the front reector, the cone of light radiating therefrom, at the front thereof,

through the front aperture of said front reflector, is not condensed, but is diEused so as to form a field local to the front of the lamp casing independently of the central beam of light condensed parallel with the focal axis common to the two reectors.

My invention comprises the various novel features of construction and arrangement hereinafter more definitely specied.

In the drawings; Figure I, is a longitudinal, vertical, sectional view of a lamp Referring Vto Fig. I; the lamp casing 1,

which is cylindrical, is provided upon opposite sides with brackets 2, whereby it may be su ported in connection with the vehicle, and 1s normally closed at the front by the door 3, comprising the plane glass panel 4. Said casing 1, is provided at its front with the parabolic reflector 7 conveniently formed of sheet aluminum, secured in rigid relation withsaid casing by the clips 8, soldered to said casing an bent over the edge of said reflector. Said casing 1, is provided at its rear with the reflector 10, which as indicated in Fig. I, conveniently consists of a metallic lm upon the back of a concave spherical se ment of glass 11, of uniform thickness. aid reflector 10, is conveniently backed with a disk 14, of asbestos paper which with the reflector is conveniently supported between the two metal rings 15 and 16; the former being soldered to the latter and the latter being soldered or otherwise secured in rigid relation with the casing 1. Between said two reflectors the casing is provided with means to produce two flames 18, and 19, local to the common focal axis 20, of said reflectors. As indicated, the means for producing said two flames conveniently consists of the single burner 23, rigidly mounted upon the topl of the burner tube 211, which is conveniently provided at its lower end with the removable cap 25, and has the valve 26, controlling the supply of gas through the .tube 27 and nipple 28 to said burner 23. Said burner tube 24, extends through the slot 29, in the bottom of the casing 1and is rigidly secured in the plate 30, fitted tol the outside of the casing 1. Said plate 30, is provided with bolts 31, which extend through corresponding slots in said ally open shield 33. Said casing is also provided at the front thereof with air inlets 36, and outlets 37, respectively local to inlets 38, and outlets 39, in the reflector 7. The products of combustion from the flames 18, and 1.9, escape through the openings 40, in the chimney cap 41. It is to be noted that both of said ames 18, and 19, are local ever, I may employ a ffore costly reflector,

-means arranged to 'produce capable ofl refracting all of the reflected rays to substantially parallel relation, su'ch a reflector being shown in Fig. II, and come prising the metallic film 45, mounted upon the glass refracting medium 46, which has a different index of refraction at its center than at its circumference, the concave face toward the burner having a curvatureA different from the reflecting surface, so that sa1d medium is thinner at its center than at its circumference.

It may a smaller scale than Fig'. I; it being intended that'a reflector constructed as shown in Fig. II, .but of the same diameter as the reflector 10, shall be s ubstituted for the latter in the modified form of the invention. l

I do not desire to limit myself to the pre-V cise detailsof construction and arrangement herein set forth, as it is obvious that various modifications may be made'therein without departing from the essential features of my` a' invention, as defined in the following claims. I .claimz-fi 1. The combination with a lamp casing' havin a concave spherical reflector at the rear t ereof; of means arran ed to produce a flame at the focal center o Said reflector;

a secondflame on the central axis of said reflector, but

nearer to said reflector than its focal center;

y projected paral whereby the ra s from said first flameV are el with said axis, and the rays from said second flame are projected' di'- vergently with respect to said axis; and, a

s parabolic reflector in front of said flames,

projected divergently with havin its focal center coincidentwith said secon flame; whereby the rays from said second flame are projected parallel with` said axis, and the-raysfrom 'said first flame are respect to said axis.

y2. 'lne combination with a lamp casing e common focal axis 20, of the two rea be noted that Fig. II, is drawn on having a condensing reflector at the rear thereof; of means arranged to produce a flame at'the focal center of said reflector; means arranged to produce a second flame on the central axis of said reflector, but nearer to said reflector than its focal center; whereby the rays from said first flame are projected parallel with said axis, and the rays from said second flame are projected divergently with respect to said axis; and, a condensing reflector in front of said flames, havin its focal axis coincident with said second flame; whereby the rays from said second flame are projected parallel with said axis, and the rays from said first flame are projected divergently with respect to said axis.

3. The combination with a lam condensing reflectors respective front and rear thereof, the focal center of the rear reflector bein in front of the focal center of the front re ector; and, means arranged to produce two separate flames respectively at the focal centers of said reflectors.

4. The combination with a lamp casing, of condensing reflectors respectively at the front and rear thereof, the focal center of the rear reflector .bein in front of the focal center of the front reector; and, means arranged to produce two separate flames respectively at the focal centers of said reflectors,"` comprising a single burner.

.5. The combination with a lamp casing having a condensing Lreflector at the rear casing, of y at the thereof; of ymeans arranged to produce a flame at the focal center of said reflector; means arran ed to produce a second flame at the centra axis of said reflector, but in the rear of its focal center, whereby the ra s from the front flame are projected paral el with said axis, and the rays from said rear flame are projected divergently with respect to said axis'.

6. The combination with a lamp casing having a condensing reflector at the front thereof; of means arranged to produce a flame at the focal center of said reflector; means arranged to produce a second flame at thecentral axis of said reflector, but in front of its focal center, whereby the rays .from said rst flame are projected parallel with said axis and the rays from said second flame are projected divergently with respect to said axis.

7.' The combination with a lamp casing, of a concave spherical reflector at the rear thereof, and a concave parabolic reflector at the front thereof, having a common focal axis, and, so disposed that the focal center of the rear reflector is in front of the focal center of the front reflector; and, means arranged to roduce two flames respectively at said ocal centers, whereby the rays from said flames are7 respectively projected parallel with said axis by one reflector, and projected diver sources are respectively projected parallel. gently with respect to said axis by the other with said axis by one reflector, and projectrelector. ed divergently with' respect to said axis by 8. rllhe combination with a lamp casing, of the other reflector. 15 5 two reflectors secured in spaced relation in In testimony whereof, I have hereunto said casing, ha a common central axis; signed my name at Philadelphia, Pennsyland, two sources o light arranged in spaced Vania, this 21st. da of January, 1907. relation on said central axis, the front source EDWI M. ROSENBLUTH. being at the focus of the rear reflector and Witnesses: a 10 the rear source being at the focus ofthe ARTHUR E. PAIGE,

front reflector; whereby the rays from both MARION R. WHITTAKER. 

